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OpenStudy (anonymous):
t^2+2t-15=0 solve.
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OpenStudy (mimi_x3):
(t-3)(t+5) t = 3, -5
jimthompson5910 (jim_thompson5910):
t^2+2t-15=0 t^2+5t-3t-15=0 (t^2+5t)+(-3t-15)=0 t(t+5)+(-3t-15)=0 t(t+5)-3(t+5)=0 (t-3)(t+5)=0 t-3 = 0 or t+5 = 0 t = 3 or t = -5
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